package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> queryListWithTree() {
        List<CategoryEntity> list = baseMapper.selectList(null);
        //获取一级菜单
        List result = list.stream().filter(item->item.getParentCid().longValue() == 0)
                .map(root->{
                    root.setChildrens(getChildrens(root,list));
                    return root;
                }).sorted(
                        (menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                }).collect(Collectors.toList());
        return result;
    }

    @Override
    public void removeMenuByIds(List<Long> list) {
        //ToDo
        baseMapper.deleteBatchIds(list);
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> list) {
        List result = list.stream().filter(item->item.getParentCid().longValue() == root.getCatId().longValue())
                     .map(categoryEntity -> {
                         categoryEntity.setChildrens(getChildrens(categoryEntity,list));
                         return categoryEntity;
                     }).sorted((item1,item2)->{
                    return (item1.getSort()==null?0:item1.getSort())-(item2.getSort()==null?0:item2.getSort());
                }).collect(Collectors.toList());
        return result;
    }
}